''Euryzygomatomys'' is a genus of South American rodents, commonly called guiaras, in the family Echimyidae. It contains two extant and one fossil species, found in Argentina, Brazil and Paraguay. They are as follows: *

Brandt's guiara Brandt's guiara (''Euryzygomatomys guiara'') is a Brazilian spiny rat species. It was formerly considered conspecific with '' E. spinosus''. References Euryzygomatomys Mammals described in 1835 {{Echimyidae-stub ...

(''Euryzygomatomys guiara'') *

Fischer's guiara Fischer's guiara (''Euryzygomatomys spinosus''), is a spiny rat species found in Argentina, Brazil and Paraguay. It is one of only two species in the genus ''Euryzygomatomys''. Its karyotype A karyotype is the general appearance of the comple ...

(''Euryzygomatomys spinosus'') * †''

Euryzygomatomys hoffstetteri ''Euryzygomatomys'' is a genus of South American rodents, commonly called guiaras, in the family Echimyidae. It contains two extant and one fossil species, found in Argentina, Brazil and Paraguay. They are as follows: * Brandt's guiara (''Euryz ...

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Tarija Formation Tarija or San Bernardo de la Frontera de Tarixa is a city in southern Bolivia. Founded in 1574, Tarija is the largest city and capital and municipality within the Tarija Department, with an airport (Capitán Oriel Lea Plaza Airport, (TJA)) offe ...

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Fossilworks Fossilworks is a portal which provides query, download, and analysis tools to facilitate access to the Paleobiology Database The Paleobiology Database is an online resource for information on the distribution and classification of fossil animals ...

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Etymology

The genus name ''Euryzygomatomys'' derives from the three Ancient Greek words (, or ''eury''), meaning "wide, or which extends in width", or (), meaning "a part of the forehead, or the zygomatic bone", and (), meaning "mouse, rat".

Phylogeny

''Euryzygomatomys'' is the sister genus to ''Clyomys''. Both taxa are closely related to the genus ''Trinomys''. In turn, these three genera — forming the clade of

Euryzygomatomyinae Euryzygomatinae is a subfamily of rodents, proposed in 2017, and containing three extant genera of spiny Echimyidae: '' Clyomys'', '' Euryzygomatomys'', and ''Trinomys''. Members_of_this_echimyid_subfamily_all_share_an_origin_in_the_eastern_part ...

— share phylogenetic affinities with a clade containing ''

Carterodon Owl's spiny rat (''Carterodon sulcidens'') is a rodent species in the family Echimyidae found in Brazil Brazil ( pt, Brasil; ), officially the Federative Republic of Brazil (Portuguese: ), is the largest country in both South America and ...

'' and members of the family Capromyidae. Analyses of craniodental characters proposed that ''Euryzygomatomys'' — and also ''Clyomys'' — may be associated with ''Carterodon''. However, molecular data suggest the

polyphyly A polyphyletic group is an assemblage of organisms or other evolving elements that is of mixed evolutionary origin. The term is often applied to groups that share similar features known as homoplasies, which are explained as a result of converg ...

of this assemblage of fossorial genera.

References

Euryzygomatomys Rodent genera Rodents of South America Mammals described in 1901 Taxa named by Émil Goeldi {{Echimyidae-stub